So today I purchased a new usb headset and plugged it into my computer. I already tested it on Steam preferences and it receives just fine but it refuses to let me change the input from "Built in" to "logitech usb headset" despite the option to change it being there. I've already used it on Skype and it works fine then but not when I play TF2. Also the computer I use is a 10.6 macbook air. Is this something I can fix or am I just going to have to play TF2 micless?